WASH Cluster – Emergency Training DR 1 DR4 1 DRAINAGE Session 4 Drainage Solutions

WASH Cluster – Emergency Training DR 2 Design exercise Task: Calculate the dimensions of a soakaway pit to drain wastewater from a communal shower area. A. In your groups, list the information you need to be able to do the calculation B. Do your assessment (ask the trainer the questions) ‏ C. Do the calculation DR4

WASH Cluster – Emergency Training DR 3 Answer Following …. Session Number here 3

WASH Cluster – Emergency Training DR 4 Exercise answer Quantity of wastewater: 10 families X 20 l water / family / day = 200 l of water / day Infiltration capacity of soil (loam): 18 l/m 2 /day Infiltration surface area required: 200 divided by 18 = 11 m 2 If the soakaway pit has a rectangular section 1m x 2m, it needs to be this deep: 11m 2 divided by 6m = Approximately 2m. 1 m 2 m DR4

WASH Cluster – Emergency Training DR 5 SOAKAWAY, what is wrong here? DR4 Photo courtesy of John Adams

WASH Cluster – Emergency Training DR 6 Group Work In your group each person chooses one drainage option below Champion your drainage solution and debate amongst the group; The pros and cons of the drainage option When would you use this solution? OUTLET TO WATERCOURSESOAKAWAY INFILTRATION TRENCHOPEN CHANNEL EVAPORATION PANSPIPES/SEWERS DR4